文档介绍：
Switching characteristics of Gauss-apodized fiber Bragg
gratings with the point defects
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WANG Xiaoyin, WANG Kuiru, YUAN Jinhui**
(State Key Laboratory of Information Photonics & munications, Beijing University of
Posts and munications, Beijing 100876)
Abstract: We discussed numerical studies of nonlinear transmission characteristic of Bragg fiber
gratings(FBG). Nonlinear coupled-mode equations are numerically solved through Runge-Kutta
method. The choice of parameters with Gauss-apodized was analyzed in the spectrum shape. It also
contributes to obtain a switching of low power consumption. We discussed the number of point defect
and width of it to find a most suitable situation to meet the demands. This approach lowers the pump
threshold power. It shows potential applications among all-optical switching.
Key words: Bragg fiber gratings; cross-phase modulation (XPM); pump threshold power; all-optical
switching
0 Introduction
All-optical switching appears to be a ponent for all-optical signal processing. Fiber
gratings attract attention due to its tiny size and mature manufacturing technology. Tavernerd
achieved a nonlinear effect switching with Bragg fiber grating under peak power of 27GW/cm2 [1] .
The transmittance varied from 0~40%. Eggleton observed stronger nonlinear effect through long
period fiber gratings [2]. This optical s